Shift Keys not working HP 49G

[sad_hp]

What a sad day! MyHP48G is no longer working at all, and my 49G is acting weird. All the buttons work except RightShift. LeftShift and Alpha. Is there anything that I am missing or is there a way to repair this?

Help, I've only got a 48GX left after this! ( I have been saving it for the Apocalypse)

[Han]

Have you tried to see if pressing on the bezel near the bottom of the screen while pressing the shift keys on your HP48 "reactivates" those keys?

[sad_hp]

Awesome! I knew someone here would have asuggestion. I pushed on the bezel and can now access my shift keys. I guess this probably points to a loose connection or something, but this is good enough for now. I don't need the advanced menus very often, but now I can get to logs and shut it off when I am done.

Thank you so much!

[BartDB]

(04-08-2015 12:55 PM)sad_hp Wrote:  Awesome! I knew someone here would have asuggestion. I pushed on the bezel and can now access my shift keys. I guess this probably points to a loose connection or something, but this is good enough for now. I don't need the advanced menus very often, but now I can get to logs and shut it off when I am done.

Thank you so much!

The problem then is that there is a rubber support inside pushing the keyboard connector flex onto the PCB, this rubber tends to deteriorate.

Here is a thread that discusses the problem:
http://www.hpmuseum.org/cgi-sys/cgiwrap/...ead=151696

If you have a wish to try to repair it:
here is a guide to opening:
http://users.ju.edu/hduong/open/

and for repairing:
http://users.ju.edu/hduong/repair/

(about halfway down see "keyboard connector" and "Rubber Under Keyboard Contacts" which is the bit that has to be replaced).

(Note: the SX shown in the links above is physically the same as the GX)

Someone's temporary fix without opening the calculator:
http://h30499.www3.hp.com/hpeb/attachmen.../HP42S.jpg
(At least the programs can be saved before dis-assembly).

Best regards.

[W_Max]

Opening old Singapore machines, using this technique, are VERY difficult. My 48sx from 91 refused to opening, even when I apply force, comparable to crack thing out So, I remove metal overlay, and then drill those latches. Metal overlay in one place (near screen) was glued so tightly, that even hot hair-dryer flow cannot help - only thin knife helps. And even after that I get some little "waves" on the metal overlay under the screen. But, anyway, It works now!